Bok-Soon runs a street stall while taking care of her younger sister. Bok-Soon may not be the brightest girl but what she lacks in intelligence, she makes up for in uncontrollable rage. She’s infamously known as the “psycho bitch” in her neighborhood. Bok-Soon’s relatively peaceful life with her sister is disrupted when they cross paths with a serial killer named Tae-Soo. Tae-Soo kills Bok-Soon’s sister because she may have stumbled upon the truth of his murderous lifestyle. Bok-Soon’s rage consumes her completely, leading her to plot her revenge on Tae-Soo.

A magician meets a weird girl and offers her to work together in his magic show. It's only until a year later that he starts to know her personally and develops a feeling towards her despite her own problems.